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t in (-oo:+oo)
(-1/8)*t > 7 // - 7
(-1/8)*t-7 > 0
-1/8*t-7 > 0 // + 7
-1/8*t > 7 // : -1/8
t < 7/(-1/8)
t < -56
t in (-oo:-56)
(-oo:-56)
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